Just try both of them, you should quickly find out which one works.
Note that USB 3.0 seems to be disabled (USB 3.0 is XHCI, simple USB 2.0 is EHCI) because you only have Enhanced Host Controller Interfaces. They might be operating as USB 2.0 or completely disabled.
When you reach a conclusion, please tell us, since this is a rather popular motherboard around here and hopefully the same data is valid for the other X10s.
I'll try every port and report back which controller each belongs to. Might be in a week though. Seems like this thread has a few months left in it ;)
The lack of USB3 is interesting. The header for case USB3 ports doesn't work, as tested with a simple USB2 keyboard; I haven't tested the lone USB3 type-A socket. I don't believe I've changed any of the default BIOS USB settings (EHCI1 enabled, EHCI2 enabled, Legacy USB Support enabled, Port 60/64 Emulation enabled, XHCI Hand-off enabled, EHCI Hand-off disabled, XHCI Mode auto).